BinarySearch的实现

package search;

import java.util.*;
import java.io.*;

public class BinarySearch
{
 public static int times;
 /** recursion binarySearch */
 public boolean recursionBinarySearch(Comparable[] data,int min,int max,Comparable target)
 {
  times++;
  boolean found = false;
  int midPoint = (min+max)/2;
  
  if (data[midPoint].compareTo(target) ==0)
  {
   found = true;
  }
  else if (data[midPoint].compareTo(target)>0)
  {
   if (min<= midPoint-1)
       found=binarySearch(data,min,midPoint-1,target);
  }
  else if (midPoint+1 <= max)
  {
   found = binarySearch(data,midPoint+1,max,target);
  }
  
  return found;
 }
 
 public resetTimes()
 {
  this.times = 0;
 }
 public boolean steadyBinarySearch(Comparable[] data,int min, int max,Comparable target)
 {
  times++;
  boolean found = false;
  int midPoint = (min+max)/2;
  
  while(min<max)
  {
   if (data[midPoint].compareTo(target) >0)
    max = midPoint;
   else
    low = midPoint;    
  }
  
  if (data[min].compareTo(target) == 0)
   found = true;
  return found;
  
 }
 
 public static void main(String [] args) throws IOException
 {
  String inString ;
  StringTokenizer tokenizer;
  Integer [] elements;
  Comparable target;
  BinarySearch bs = new BinarySearch();
  
  BufferedReader in = new BufferedReader( new InputStreamReader(System.in));
  
  //get size
  System.out.println("Please input the size ( size>0 ): ");
  inString = in.readLine();
  elements = new Integer[Integer.parseInt(inString)];
  
  //get data[]
  System.out.println("Enter the numbers of elements :(gap it with Key_space or Key_tab) ");
  inString = in.readLine();
  tokenizer = new StringTokenizer(inString);
  for (int i =0; i<elements.length && tokenizer.hasMoreTokens();i++)
  {
   elements[i] = Integer.parseInt(tokenizer.nextToken());
  }
  
  //get target
  System.out.println("Please input target element: ");
  inString = in.readLine();
  target = new Integer(Integer.parseInt(inString));
  
  long startTime = System.currentTimeMillis();
  
  boolean found = bs.recursionBinarySearch(elements,0,elements.length-1,target);
  
  System.out.println("the result: "+found);
  System.out.println("take time = "+(System.currentTimeMillis()-startTime));
  System.out.println("size : "+elements.length+" , cursory times : "+times);
 }
}